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Firefighters work to dig a fire line on the Rocky Fire in Lake County, California July 30, 2015. The Rocky Fire broke out on Wednesday afternoon in Lake County, 110 miles (180 km) north of San Francisco. By Thursday morning it had spread to 8,000 acres (3,237 hectares), according to the California Department of Forestry and Fire Protection, known as Cal Fire. REUTERS/Max Whittaker